(i) the phonemes /p/, /t/, /k/, /n/, /w/, /l/, /m/, /f/ (and in
some dialects, a quick /j/) can only be preceded by /s/, and not by any other
consonant; conversely, /s/ can only precede these consonants, and not others,
e.g., /*sb/, /*sv/, /*sh/, etc. (note: /sf/ is very
limited in productivity, mainly appearing in technical terminology. The
most common example is sphere and its various related words. /sv/ appears in
svelte, which is a loanword from French.)
(ii)/ɹ/ can only follow /p/, /b/, /t/, /d/, /k/, /ɡ/, /f/,
/v/, /ʃ/, and /θ/, in a consonant cluster, and not others. (note: /vr/ is so unproductive that it only appears in vroom,
an onomatopoeia.)
(iii)not all
three-consonant clusters can appear in
syllable-initial position, but only
/s/^voiceless plosive^/l/ or /r/, e.g., scream /skɹiːm/, splay /spleɪ/,
strange /stɹeɪnʤ/, spring /spɹɪŋ/, etc
(iv)/ŋ/ never appears after long vowels or diphthongs
(v)/ʧ/, /ʤ/, and /ð/ do not cluster
(vi)/ɹ/, /w/, and /l/ only occur alone, or in a cluster
following another consonant
(vii)/h/, /w/, and /j/ do not appear in syllable-final
position
(viii)/ɛ/, /æ/, /ɒ/, /ʌ/, /ɪ/, and /ʊ/ have to be followed by
another phone
(ix)/ʊ/ cannot appear at syllable-initial position
(x)/ʒ/ cannot appear at the beginning of a word except in
loanwords, e.g., genre
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